<!DOCTYPE html>
<html lang="zh-CN">
<head>
	<meta charset="UTF-8">
	<title>进度条</title>
	<style type="text/css">
		.sk {
			width: 200px;
			height: 30px;
			border: 1px solid red;
			border-radius: 15px;
		}
		.bar {
			width: 50%;
			height: 30px;
			background-color: green;
			border-radius: 15px 0 0 15px;
		}
	</style>
</head>
<body>
	<div class="sk">
		<div class="bar"></div>
	</div>
</body>
</html>